Rockwell Automation MD60 User Manual Version 3.0 - Manual (Page 22)

4-2 MD60 AC Drive User Manual
Ground Fault Monitoring
If a system ground fault monitor is to be used, only Type B
(adjustable) devices should be used to avoid nuisance tripping.
Safety Ground - (PE)
This is the safety ground for the drive that is required by code. One
of these points must be connected to adjacent building steel (girder,
joist), a floor ground rod, or bus bar. Grounding points must comply
with national and local industrial safety regulations and/or electrical
codes.
Motor Ground
The motor ground must be connected to one of the ground
terminals on the drive.
Shield Termination - SHLD
Either of the safety ground terminals located on the power terminal
block provides a grounding point for the motor cable shield. The
motor cable shield connected to one of these terminals (drive end)
should also be connected to the motor frame (motor end). Use a
shield terminating or EMI clamp to connect the shield to the safety
ground terminal. The NEMA 1/IP30 Kit may be used with a cable
clamp for a grounding point for the cable shield.
When shielded cable is used for control and signal wiring, the
shield should be grounded at the source end only, not at the drive
end.
4.1 RFI Filter Grounding
Using single-phase drives with integral filter, or an external filter with
any drive rating, may result in relatively high ground leakage
currents. Therefore, the filter must only be used in installations
with grounded AC supply systems and be permanently
installed and solidly grounded (bonded) to the building power
distribution ground.
Ensure that the incoming supply neutral is solidly connected
(bonded) to the same building power distribution ground. Grounding
must not rely on flexible cables and should not include any form of
plug or socket that would permit inadvertent disconnection. Some
local codes may require redundant ground connections. The
integrity of all connections should be periodically checked.